Klutz, The Clumsiest Warrior
I was trying to think of the most pathetic character to still be Viable as a champion, and came up with a champion cursed with bad luck. Also he's a tank who casts all spells from health. He also carries a wooden stick.
Passive - Bad Luck: Both Klutz, and the last enemy Klutz has damaged withing the last few seconds, has a lowered crit chance, with the possibility of getting critical fails that deal half damage if their current crit chance is low enough.
Q - Trip: Fall over, dealing physical damage in an area in front of you and knocking all enemies back, but also you need a second to get up.
w - Fumble: A skillshot that throws your wooden stick that deals damage and slow, the skillshot stops at the first enemy struck and doesn't go over walls, but until you go over and pick it up, or until around 15 seconds later if you truly can't get to it, you deal reduced damage with your autoattacks.
E - Whack: Swing your stick in a cone, the animation showing you swinging counterclockwise, and as you do so you dash to the right of the direction you cast the spell in, falling over and stunning whoever you run into.
R - Catastrophe: Summons a swarm of Black Cat spirits around himself, that target both him and his opponent.
Basically you cast spells to CC lock your opponent before summoning the cats, intended to be played as a support or top laner.